but bigger how hard would it be to do this you think, i love the sound reminds me of aphex twin druqs.
That can be done. Show us what you come up with, it looks interesting.
It's absolutely possible. I think that in a project like this the most challenging part is all the mechanical work.
Things you should look to learn first is how to use solenoids, stepper motors, and servo motors with Arduino.
If you want a head start then look at my page on the Glockenspiel
http://www.thebox.myzen.co.uk/Hardware/Glockenspiel.html
It's not as big as that system in the video but there is no reason why it can't be expanded.